Measuring and testing – Muscular force – Including a rotary element with a braking means
Patent
1991-10-04
1993-11-02
Woodiel, Donald O.
Measuring and testing
Muscular force
Including a rotary element with a braking means
73862326, 482900, A61B 522
Patent
active
052575403
ABSTRACT:
An instrumentation system for measuring the instantaneous pedal force and power exerted by the rider of a cycle is described. Being small and lightweight, it is intended to be mounted on the cycle and to operate while the cycle is ridden. The pedal crank assembly is modified to provide an elastic support for the chainring assembly, allowing a small relative rotation between pedals and chainrings when force is applied to the pedals. This rotation is a function of the magnitude of the force and is detected by angle detectors, consisting of angle indicators rotating with the pedal crank assembly and stationary sensors mounted on the cycle frame. These angle detectors measure the relative rotation at 25 or more positions distributed around a revolution of the pedal crank assembly. Electrical signals from the sensors are coupled to a microprocessor. The processor compares the signals, computes the applied pedal force and power at each measurement position, and displays and/or stores the results. A procedure is given for individually calibrating each measurement, thereby greatly reducing repetitive errors.
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patent: 5027303 (1991-06-01), Witte
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patent: 5067354 (1991-11-01), Kawai
Bower Grant L.
Kingsford-Smith Charles A.
McIlraith Terry E.
Dougherty Elizabeth L.
Kingsford-Smith Charles A.
Woodiel Donald O.
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